Brake



1 1 F. c. Fl'ANK 2,041,463

BRAKE Filed Dec. 19, 1932 INVE NTOR. fiefofe/c/r C FfiN/f A TTORNEY.

estates May re. rest assists esrlr Application December lid, 1932, Serial No. Middd 2 Claims,

This invention relates to brakes and more partlcularly to brakes especially designed for use on the wheels of an airplane.

One of the objects of the invention is to pro- 5 vide improved means for guiding and limiting the lateral movement of the brake shoes which coact with a brake drum in the braking operation.

A further object is to provide an anchor formed es a part of a brake applying fluid motor, the lo unit thus serving both as an applying means and an anchoring means.

Features of the invention include a fluid motor cylinder formed with a pair of spaced extensions or forks which are positioned on each side of an associated brake shoe to guide the shoe laterally; an eccentric pin adapted to be adjustably inserted through aligned holes in the spaced extensions for anchoring the shoe; and an. adjustable eccentric steady rest pin formed with a shoulder and pro- 2o vided with a washer, the shoulder and washer cooperating to guide the shoe.

Further features and objects of the invention will be apparent after a reading of the suhjoined specification and claims and after a consideration 25 of the accompanying drawing, in which:

Figure l. is a View in vertical section. of a brake for an airplane wheel;

Figure 2 is an enlarged view in section taken substantially on the line- 2-2 of Figure l; and

so figure 3 is an enlarged view in section taken substantially on the line 3-3 of Figure 1.

Referring particularly to the wine, thereis shown a brake dr ill, equipped with shoes 52 and it, these shoes being substantially alike. ,The 35 brake is equipped with a backing plate to to which there is secured, by bolts such as ill, at, and 22, a pair of fluid motors or brake applying cylinders 2t and 25.

- The cylinders id and 26 are alike and detailed description of one will sufilce for both. The cylinder 2% has formed integrally therewith, as is shown most clearly in Figures 2 and 3, a pair of spaced plates 28 and 3% adapted to receive be= 45 tween them the anchoring end 32 of the assoclated brake shoe, thus guiding the end of the shoe laterally.

As shown in Figures 6 and 2, the cylinder 26 is also provided with a piston 36 equipped with a 50 sealing cup 35, the piston being adapted to bear upon a. pin 38 which transmits brake applying force to the free end of the shoe l2. A spring 60' is provided to bear against the closed end of the cylinder and against the cup 36 to maintain the 55 cup in contact with the piston 34. A rubber boot t2 closes the open end oi'the cylinder to prevent the entrance of dust, etc.

The ends of the shoes it and it, opposite to those against which the pins of the fluid motors act, anchor on the opposite cylinders. To this 5 end the plates 28 and to of both cylinders are provided with circular holes such as M, in each pair of which there is secured an eccentric anchor pin such as and title.

Also secured to the backlog" plate it are steady to rest bolts 38 and ids each termed with an eccentric reduced projection Ed. The projections lit] extend through d-shaped openings ti and lilo formed in the shoes it and M respectively and thus serve to limit the return movement of the 115 shoes when the brake is released. 02: the end or the projection til there is placed a Washer 53 held in position by a cotter pin 5d, and the web of the shoe it is positioned between the enlarged portion of the pin to and the washer 5%.? so that the plus 68 and tide serve to position the free ends of the shoes laterally. As stated above, the opposite anchored ends oi the shoes are positioned laterally by reason oi their position between the plates 28 and til.

It is clear that by rotation of the pin 68 or Silo the eccentric portions lid are caused to rotate. Inasmuch as the return springs maintain the fiat portion of the o slots against the eccentric por tlous, the return positions of the shoes can thus be accurately controlled by the adjustment. The rounded portions of the it slots allow brake applying movement of the shoes.

it is eved that the operation of the brake described will. be apparent from the above dioclosure. The supply of braking fluid to the cylfinders 2t and to causes the pistons to he moved I and the shoes it and it respectively to be moved into contact with the it. Inasmuch as the airplane wheel is only adapted to t in a ior- 40 Ward direction, the rotation of the forces the shoes to anchor upon the pins 36 and fits and through the pins upon the cylinders 26 and 24 The pins to and tits serve, together with the integral plates on the cylinders, to position the shoes laterally of the drum.

It is to be understood that the above described ement of the invention is for the p of illustration only and various changes may be de therein without departing from the spirit 5@ and scope of the invention.

I claim:

1. In a. wheel brake; a drum, a backing plate; a pair of eccentric pins secured to said backing plate adjacent to the circumlerence thereof and positioned substantially diametrically opposite to each other, a pair of shoes positioned in said drum and each having one end formed with a semi-circular recess adapted at times to contact.

with one of said eccentric pins; 8. pair of fluid motors each formed integrally with a pair of spaced plates, each plate being provided with a circular hole through which one of said eccentric -pins extends and each plate extending on the opposite side of said pin from the motor and the two plates embracing between them the recesesd end of the shoe contacting with the associated pin; and a piston in each of said motors tor moving the friction shoe other than the one which contacts with the adjacent pin into contact with the drum, whereby the eccentric pin and the spaced plates cooperate to limit the movement of the recessed end of the floating shoe both laterally and circumferentially.

2. In a wheel brake; a drum, a backing plate; a pair of eccentric pins secured to said backing plate adjacent to the circumference thereof and positioned substantially diametrically opposite to each other, a pair of shoes positioned in said drum and each having one end formed with a semi-circular recess adapted at times to contact with one of said eccentric plus; a pair of fluid motors each i'ormed integrally with a pair of spaced plates, each plate being provided with a circular hole through which one of said eccentric pins extends and each plate extending on the opposite side of said pin from the motor and the two plates embracing between them the recessed end of the shoe contacting with the associated pin; and a piston in each of said motors for moving the friction shoe other than the one which contacts with the adjacent pin into contact with the drum. whereby the eccentric pin and the spaced plates cooperate to limit the movement oi the recessed end 0! the floating shoe both laterally and circumierentially, said eccentric pin being formed with a reduced concentric portion extending through and secured to the backing plate, an enlarged concentric portion extending through one of said spaced plates, an eccentric portion adapted to contact with the recessed end of the associated shoe. and another enlarged concentric portion extending through the other spaced plate.

. FREDERICK C. FRANK. 

